mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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8b02e40602
...so it continues when M4 is shut down. It's not as pretty as using DMA, but it's far simpler, even if it involves letting the ADC run continuously and taking the last samples even if not synchronizing to the phase of the sampling of the channels.
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "touch.hpp"
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#include <cstdint>
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#include "adc.hpp"
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#include "utility.hpp"
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#include "hal.h"
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using namespace lpc43xx;
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#include "hackrf_hal.hpp"
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using namespace hackrf::one;
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#include "portapack_adc.hpp"
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#include "portapack_shared_memory.hpp"
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namespace touch {
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namespace adc {
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constexpr uint8_t adc0_sel =
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(1 << portapack::adc0_touch_xp_input)
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| (1 << portapack::adc0_touch_xn_input)
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| (1 << portapack::adc0_touch_yp_input)
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| (1 << portapack::adc0_touch_yn_input)
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;
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const auto adc0_interrupt_mask = flp2(adc0_sel);
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constexpr lpc43xx::adc::CR adc0_cr {
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.sel = adc0_sel,
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.clkdiv = 49, /* 400kHz sample rate, 2.5us/sample @ 200MHz PCLK */
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.resolution = 9, /* Ten clocks */
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.edge = 0,
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};
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constexpr lpc43xx::adc::Config adc0_config {
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.cr = adc0_cr,
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};
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void init() {
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adc0.clock_enable();
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adc0.interrupts_disable();
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adc0.power_up(adc0_config);
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adc0.interrupts_enable(adc0_interrupt_mask);
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}
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void start() {
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adc0.start_burst();
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}
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// static constexpr bool monitor_overruns_and_not_dones = false;
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Samples get() {
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const auto xp_reg = LPC_ADC0->DR[portapack::adc0_touch_xp_input];
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const auto xn_reg = LPC_ADC0->DR[portapack::adc0_touch_xn_input];
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const auto yp_reg = LPC_ADC0->DR[portapack::adc0_touch_yp_input];
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const auto yn_reg = LPC_ADC0->DR[portapack::adc0_touch_yn_input];
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return {
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(xp_reg >> 6) & 0x3ff,
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(xn_reg >> 6) & 0x3ff,
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(yp_reg >> 6) & 0x3ff,
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(yn_reg >> 6) & 0x3ff,
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};
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}
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} /* namespace adc */
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} /* namespace touch */
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